Servicestack或lite错误中的计算字段

我无法使其工作，我使用ServiceStack ormlite Sql server:为computed field添加了data annotation

[Compute, Ignore]
public string FullName { get; set; }

问题是我的LoadSelect<Employee>()方法没有从computed字段加载colunm FullName。为什么？

如果我删除了它加载的[Ignore]，但当我使用.create()方法创建新记录时，它会返回一个错误，可能是因为它试图为FullName字段添加一个值。

表格

CREATE TABLE [dbo].[Employee](
    [EmployeeId] [int] IDENTITY(1,1) NOT NULL,
    [FullName]  AS (concat(ltrim(rtrim([FirstName])),' ',ltrim(rtrim([LastName])))) PERSISTED NOT NULL,
    [FirstName] [nvarchar](55) NOT NULL,
    [LastName] [nvarchar](55) NULL,
    [Username] [nvarchar](55) NOT NULL,
    [Password] [nvarchar](55) NULL
 CONSTRAINT [PK_Employee] PRIMARY KEY CLUSTERED 
(
    [EmployeeId] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON, FILLFACTOR = 80) ON [PRIMARY]
) ON [PRIMARY]

员工类别：

[Schema("dbo")]
[Alias("Employee")]
public class Employee : IHasId<int>
{
    [PrimaryKey]
    [Alias("EmployeeId")]
    [AutoIncrement]
    [Index(Unique = true)]
    public int Id { get; set;}
    [Required]
    public string FirstName { get; set; }
    public string LastName { get; set; }
    [Required]
    [Index(true)]
    public string Username { get; set; }
    public string Password { get; set; }
    [Compute, Ignore]
    public string FullName { get; set; }
}

获取方法：

    public virtual async Task<IEnumerable<T>> Get<T>() where T : IHasId<int>
    {
        using (var dbCon = DbConnectionFactory.OpenDbConnection())
        {
            return await dbCon.LoadSelectAsync<T>(x => x);
        }
    }

创建方法：

    public virtual async Task<T> Create<T>(T obj) where T: IHasId<int>
    {
        using (var dbCon = DbConnectionFactory.OpenDbConnection())
        {
            // if there is an id then INSERTS otherwise UPDATES
            var id = obj.GetId().SafeToLong();
            if (id > 0)
                dbCon.Update(obj);
            else
                id = dbCon.Insert(obj, true);   
            // returns the object inserted or updated
            return await dbCon.LoadSingleByIdAsync<T>(id);
        }
    }

db.DropTable<Employee>();
db.ExecuteSql(@"
CREATE TABLE [dbo].[Employee](
[EmployeeId] [int] IDENTITY(1,1) NOT NULL,
[FullName]  AS (concat(ltrim(rtrim([FirstName])),' ',ltrim(rtrim([LastName])))) PERSISTED NOT NULL,
[FirstName] [nvarchar](55) NOT NULL,
[LastName] [nvarchar](55) NULL,
[Username] [nvarchar](55) NOT NULL,
[Password] [nvarchar](55) NULL
CONSTRAINT [PK_Employee] PRIMARY KEY CLUSTERED ([EmployeeId] ASC)");
var item = new Employee
{
    FirstName = "FirstName",
    LastName = "LastName",
    Username = "Username",
    Password = "Password",
    FullName = "Should be ignored",
};
var id = db.Insert(item, selectIdentity: true);
var row = db.LoadSingleById<ComputeTest>(id);
Assert.That(row.FirstName, Is.EqualTo("FirstName"));
Assert.That(row.FullName, Is.EqualTo("FirstName LastName"));
row.LastName = "Updated LastName";
db.Update(row);
row = db.LoadSingleById<ComputeTest>(id);
Assert.That(row.FirstName, Is.EqualTo("FirstName"));
Assert.That(row.FullName, Is.EqualTo("FirstName Updated LastName"));

var row = await Create(item);
Assert.That(row.FirstName, Is.EqualTo("FirstName"));
Assert.That(row.FullName, Is.EqualTo("FirstName LastName"));
row.LastName = "Updated LastName";
row = await Create(row);
Assert.That(row.FirstName, Is.EqualTo("FirstName"));
Assert.That(row.FullName, Is.EqualTo("FirstName Updated LastName"));